Lew, I use a Resomat and prefer it to direct coupling on my L07D and VPI TNT. However, the Resomat can sound a bit light and tizzy without a clamp or record weight to bring the LP into full engagement with the two full circles of vinyl cones on the mat that mate with the record lead-in and run-out sections. Too much weight or pressure becomes counter-productive, cupping the LP away from the outer circle of cones. To prevent cupping I stack rubber washers on the spindle above and below the Resomat. When the record weight is applied the perimeter cups down.
All of this may seem like too much trouble, but it's really no big deal.
All of this may seem like too much trouble, but it's really no big deal.